US7736719B2 - Protection panel for aircrafts - Google Patents

Protection panel for aircrafts Download PDF

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Publication number
US7736719B2
US7736719B2 US12/001,148 US114807A US7736719B2 US 7736719 B2 US7736719 B2 US 7736719B2 US 114807 A US114807 A US 114807A US 7736719 B2 US7736719 B2 US 7736719B2
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United States
Prior art keywords
protection panel
panel
layers
engine
panel according
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US12/001,148
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US20080145618A1 (en
Inventor
Giuliano Cattaneo
Luca Bottero
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alenia Aermacchi SpA
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Alenia Aermacchi SpA
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Filing date
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Assigned to ALENIA AERMACCHI S.P.A. reassignment ALENIA AERMACCHI S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOTTERO, LUCA, CATTANEO, GIULIANO
Publication of US20080145618A1 publication Critical patent/US20080145618A1/en
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Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D29/00—Power-plant nacelles, fairings, or cowlings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/04—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position
    • F01D21/045—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position special arrangements in stators or in rotors dealing with breaking-off of part of rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0471—Layered armour containing fibre- or fabric-reinforced layers
    • F41H5/0485—Layered armour containing fibre- or fabric-reinforced layers all the layers being only fibre- or fabric-reinforced layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y10T428/192—Sheets or webs coplanar
    • Y10T428/195—Beveled, stepped, or skived in thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24488—Differential nonuniformity at margin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24777—Edge feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers

Definitions

  • the present invention relates to a protection panel for aircrafts.
  • the present invention relates to a protection panel for engines or other critical aircraft components suitable for the absorption of impact with fragments for example metallic having a high kinetic energy which could cause a catastrophic breakage of one or more components of another engine of the aircraft.
  • twin-engine aeroplanes even on long-range lines makes it fundamental to protect engines or other critical components from impact with splinters expelled from the other engine due to the breakage of moving mechanical organs.
  • the Applicant has faced the problem of simply, effectively and economically protecting engines from damage due to interferences with objects, for example projected towards the fan cowl of the engine itself by the breakage of another engine of the aircraft.
  • a multilayer panel be installed having at least one layer of fabric or unidirectional made of aramid fibre.
  • the various layers can be bound to each other by means of a resin which should then be polymerized according to a specific treating cycle on a suitable mould, or by sewing the various layers together.
  • An aspect of the present invention relates to a protection panel for an aircraft suitable for being associated with at least a portion of the surface to be protected, characterized in that it comprises a plurality of layers associated with each other made of aramid fibre in which at least one of said layers consists of an aramid fibre or unidirectional fabric.
  • FIG. 1 a represents a schematic view of an aircraft engine
  • FIG. 1 b schematically represents the fuselage of an aircraft
  • FIG. 2 a is a schematic view of a portion of the hood of the engine on which the panel according to the present invention is applied;
  • FIG. 2 b is a schematic view of a portion of fuselage plating on which the panel according to the present invention is applied;
  • FIG. 3 is a schematic perspective view of a panel according to the present invention.
  • FIG. 4 is a section of a detail of the edge of the panel according to the present invention.
  • the engine body 2 of an aircraft is in the form of an oblong casing having inside the turboreactor with all its elements, such as for example, the turbine, the compressor and the combustion chamber.
  • the supporting structure of the engine or its casing is conventionally called “nacelle” and has at least one openable portion, through which it is possible to have access to all the internal elements of the engine.
  • FIG. 1A shows a casing 2 having an opposite pair of openable portions 21 and 22 positioned in front of each other with respect to the longitudinal axis of the casing.
  • FIG. 1B representing an aircraft, illustrates two portions of casing 23 and 24 situated in correspondence with critical components.
  • FIG. 2A for example illustrates one of the two openable portions 22 partially covered internally by a panel 3 produced according to the present invention
  • FIG. 2B illustrates one of the two portions 23 or 24 partially covered internally by a panel 3 produced according to the present invention.
  • the panel 3 can cover plating areas, for example of the fuselage in correspondence with critical components or power generation units (APU) for the containment of splinters due to breakage of a moving component.
  • APU power generation units
  • the panel 3 substantially comprises a plurality of layers associated with each other made of aramid fibre. At least one of these layers consists of an aramid fibre or unidirectional fabric.
  • the aramid fibre is an aromatic polyamide fibre generally used as reinforcement of plastic materials in the production of high-quality composites (for competition canoes, bulletproof jackets, protective helmets, etc.).
  • the various layers are bound to each other for example by means of a resin which should then be polymerized according to a specific treatment cycle on a suitable mould, or by sewing the various layers together.
  • FIGS. 3 and 4 illustrate an embodiment example of said panel positioned on a flat support 4 which simulates the internal surface of the nacelle of the engine, in which the various layers are arranged so that the panel can be stepped 31 in its perimetric area, which is advantageous with respect to the ratio between the performances and weights of the panel 3 .
  • the panel can also have a strap, for example metallic, which covers the aramid layer.
  • Mechanical connection elements of the panel to the surface to be covered can also be advantageously envisaged on the perimetric layer.
  • the installation of the panel can generally be effected by gluing (as illustrated in FIG. 4 which shows a layer of glue 5 ), the use of mechanical connection elements, velcro or any other system which, alone or in collaboration with those mentioned, is capable of holding the protection panel in position.
  • the total sealing of the edges and exposed surface of the ballistic panel completes the production phase and guarantees insulation of the panel from aggressive and atmospheric agents.
  • the solution proposed is completely passive and does not at all influence the structural aspects of the component to which it is applied.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Laminated Bodies (AREA)
  • Reinforced Plastic Materials (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Liquid Crystal (AREA)

Abstract

Protection panel (3) for an aircraft suitable for being associated with at least a portion of the surface to be protected, consisting of a plurality of layers associated with each other made of aramid fibre in which at least one of said layers consists of an aramid fibre or unidirectional fabric.

Description

BACKGROUND OF THE INVENTION
The present invention relates to a protection panel for aircrafts.
In particular, the present invention relates to a protection panel for engines or other critical aircraft components suitable for the absorption of impact with fragments for example metallic having a high kinetic energy which could cause a catastrophic breakage of one or more components of another engine of the aircraft.
The ever-increasing use of twin-engine aeroplanes even on long-range lines makes it fundamental to protect engines or other critical components from impact with splinters expelled from the other engine due to the breakage of moving mechanical organs.
Traditional solutions use metallic protections installed directly on the engine for this purpose.
These traditional solutions mainly have the disadvantage of being heavy, costly and obstructing maintenance operations.
The Applicant has faced the problem of simply, effectively and economically protecting engines from damage due to interferences with objects, for example projected towards the fan cowl of the engine itself by the breakage of another engine of the aircraft.
In particular, the solution found envisages that on the fan cowl of the engine or plating adjacent to other critical components, a multilayer panel be installed having at least one layer of fabric or unidirectional made of aramid fibre. The various layers can be bound to each other by means of a resin which should then be polymerized according to a specific treating cycle on a suitable mould, or by sewing the various layers together.
SUMMARY OF THE INVENTION
An aspect of the present invention relates to a protection panel for an aircraft suitable for being associated with at least a portion of the surface to be protected, characterized in that it comprises a plurality of layers associated with each other made of aramid fibre in which at least one of said layers consists of an aramid fibre or unidirectional fabric.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and objectives of the present invention will appear evident from the following description and enclosed drawings, provided for purely illustrative and non-limiting purposes, wherein:
FIG. 1 a represents a schematic view of an aircraft engine;
FIG. 1 b schematically represents the fuselage of an aircraft;
FIG. 2 a is a schematic view of a portion of the hood of the engine on which the panel according to the present invention is applied;
FIG. 2 b is a schematic view of a portion of fuselage plating on which the panel according to the present invention is applied;
FIG. 3 is a schematic perspective view of a panel according to the present invention;
FIG. 4 is a section of a detail of the edge of the panel according to the present invention.
 DETAILED DESCRIPTION OF THE INVENTION
With reference to the above figures, the engine body 2 of an aircraft is in the form of an oblong casing having inside the turboreactor with all its elements, such as for example, the turbine, the compressor and the combustion chamber. In the aeronautical field the supporting structure of the engine or its casing is conventionally called “nacelle” and has at least one openable portion, through which it is possible to have access to all the internal elements of the engine. FIG. 1A shows a casing 2 having an opposite pair of openable portions 21 and 22 positioned in front of each other with respect to the longitudinal axis of the casing.
FIG. 1B representing an aircraft, illustrates two portions of casing 23 and 24 situated in correspondence with critical components.
These openable portions and other portions of the internal surface of the nacelle of the engine or fuselage can be covered with the panel according to the present invention. FIG. 2A for example illustrates one of the two openable portions 22 partially covered internally by a panel 3 produced according to the present invention; FIG. 2B illustrates one of the two portions 23 or 24 partially covered internally by a panel 3 produced according to the present invention. The panel 3 can cover plating areas, for example of the fuselage in correspondence with critical components or power generation units (APU) for the containment of splinters due to breakage of a moving component.
The panel 3 substantially comprises a plurality of layers associated with each other made of aramid fibre. At least one of these layers consists of an aramid fibre or unidirectional fabric.
The aramid fibre is an aromatic polyamide fibre generally used as reinforcement of plastic materials in the production of high-quality composites (for competition canoes, bulletproof jackets, protective helmets, etc.).
The various layers are bound to each other for example by means of a resin which should then be polymerized according to a specific treatment cycle on a suitable mould, or by sewing the various layers together.
FIGS. 3 and 4 illustrate an embodiment example of said panel positioned on a flat support 4 which simulates the internal surface of the nacelle of the engine, in which the various layers are arranged so that the panel can be stepped 31 in its perimetric area, which is advantageous with respect to the ratio between the performances and weights of the panel 3. On the perimetric area, the panel can also have a strap, for example metallic, which covers the aramid layer. Mechanical connection elements of the panel to the surface to be covered can also be advantageously envisaged on the perimetric layer. The installation of the panel can generally be effected by gluing (as illustrated in FIG. 4 which shows a layer of glue 5), the use of mechanical connection elements, velcro or any other system which, alone or in collaboration with those mentioned, is capable of holding the protection panel in position.
The advantages offered by the solution proposed consist in both an improvement in the weight/efficacy and cost/efficacy ratio with respect to the conventional metal solutions. Further advantages are the increased accessibility to parts of the propeller or other critical components in the maintenance phases, if the panels are installed on the openable portions. Said panel is in fact significantly lighter, economical and versatile than the equivalent traditional solutions used so far.
The total sealing of the edges and exposed surface of the ballistic panel completes the production phase and guarantees insulation of the panel from aggressive and atmospheric agents.
The solution proposed is completely passive and does not at all influence the structural aspects of the component to which it is applied.

Claims (6)

1. A protection panel (3) for an aircraft suitable for being associated with at least a portion of a surface to be protected, characterized in that the protection panel comprises a plurality of layers associated with each other in which at least one of said layers consists of an aramid fibre, the layers being arranged so that the panel is stepped (31) in a perimetric area in which mechanical connections to said aircraft are provided and wherein the panel also has a strap on said perimetric area.
2. The protection panel according to claim 1, wherein the layers are bound to each other by means of a resin.
3. The protection panel according to claim 1, wherein the layers are bound to each other by means of sewing.
4. The protection panel according to claim 1, characterized in that the protection panel is glued onto a surface to be covered.
5. The protection panel according to claim 1, wherein the protection panel is associated with an internal surface of openable portions (21, 22) of a fan cowl (2) of an engine or other critical components (23, 24)
6. The protection panel according to claim 1, wherein said at least one layer is an unidirectional fabric.
US12/001,148 2006-12-14 2007-12-10 Protection panel for aircrafts Expired - Fee Related US7736719B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI2006A002408 2006-12-14
IT002408A ITMI20062408A1 (en) 2006-12-14 2006-12-14 PROTECTION PANEL FOR VEHICLES
ITMI2006A2408 2006-12-14

Publications (2)

Publication Number Publication Date
US20080145618A1 US20080145618A1 (en) 2008-06-19
US7736719B2 true US7736719B2 (en) 2010-06-15

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US12/001,148 Expired - Fee Related US7736719B2 (en) 2006-12-14 2007-12-10 Protection panel for aircrafts

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US (1) US7736719B2 (en)
EP (1) EP1932759B1 (en)
AT (1) ATE495976T1 (en)
DE (1) DE602007012044D1 (en)
ES (1) ES2359943T3 (en)
IT (1) ITMI20062408A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090101759A1 (en) * 2007-10-18 2009-04-23 Airbus Uk Limited Panel with impact protection membrane
US20100101205A1 (en) * 2007-03-30 2010-04-29 Airbus France Device for deflection and retention of aircraft engine debris
US11428160B2 (en) 2020-12-31 2022-08-30 General Electric Company Gas turbine engine with interdigitated turbine and gear assembly

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891996A (en) * 1974-07-29 1975-07-01 Burlington Industries Inc Ballistic vest
US3974313A (en) 1974-08-22 1976-08-10 The Boeing Company Projectile energy absorbing protective barrier
GB2130073A (en) * 1982-11-11 1984-05-31 Personnel Armoured Designs Lim Protective shield
GB2159886A (en) 1984-06-07 1985-12-11 Rolls Royce Fan duct casing
US5102723A (en) 1989-11-13 1992-04-07 Pepin John N Structural sandwich panel with energy-absorbing material pierced by rigid rods
US5343796A (en) 1990-03-08 1994-09-06 Allied-Signal Inc. Armor systems
EP0906977A1 (en) 1997-10-03 1999-04-07 M. Wright & Sons Ltd. Improvements in or relating to fabrics
US6238768B1 (en) * 1996-06-24 2001-05-29 Dsm N.V. Antiballistic shaped part
US20040144244A1 (en) 2001-02-05 2004-07-29 Sargent Wayne B. Ballistic resistant materials and method of manufacture
US20070079920A1 (en) * 2005-10-11 2007-04-12 United Technologies Corporation Method of repair for inlet caps of turbine engines

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891996A (en) * 1974-07-29 1975-07-01 Burlington Industries Inc Ballistic vest
US3974313A (en) 1974-08-22 1976-08-10 The Boeing Company Projectile energy absorbing protective barrier
GB2130073A (en) * 1982-11-11 1984-05-31 Personnel Armoured Designs Lim Protective shield
GB2159886A (en) 1984-06-07 1985-12-11 Rolls Royce Fan duct casing
US5102723A (en) 1989-11-13 1992-04-07 Pepin John N Structural sandwich panel with energy-absorbing material pierced by rigid rods
US5343796A (en) 1990-03-08 1994-09-06 Allied-Signal Inc. Armor systems
US6238768B1 (en) * 1996-06-24 2001-05-29 Dsm N.V. Antiballistic shaped part
EP0906977A1 (en) 1997-10-03 1999-04-07 M. Wright & Sons Ltd. Improvements in or relating to fabrics
US20040144244A1 (en) 2001-02-05 2004-07-29 Sargent Wayne B. Ballistic resistant materials and method of manufacture
US20070079920A1 (en) * 2005-10-11 2007-04-12 United Technologies Corporation Method of repair for inlet caps of turbine engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EP Search Report Dated Apr. 18, 2008.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100101205A1 (en) * 2007-03-30 2010-04-29 Airbus France Device for deflection and retention of aircraft engine debris
US20090101759A1 (en) * 2007-10-18 2009-04-23 Airbus Uk Limited Panel with impact protection membrane
US8322657B2 (en) * 2007-10-18 2012-12-04 Airbus Operations Limited Panel with impact protection membrane
US11428160B2 (en) 2020-12-31 2022-08-30 General Electric Company Gas turbine engine with interdigitated turbine and gear assembly

Also Published As

Publication number Publication date
ITMI20062408A1 (en) 2008-06-15
EP1932759B1 (en) 2011-01-19
DE602007012044D1 (en) 2011-03-03
EP1932759A1 (en) 2008-06-18
ATE495976T1 (en) 2011-02-15
US20080145618A1 (en) 2008-06-19
ES2359943T3 (en) 2011-05-30

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Owner name: ALENIA AERMACCHI S.P.A., ITALY

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Effective date: 20071205

Owner name: ALENIA AERMACCHI S.P.A.,ITALY

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STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20140615

FP Lapsed due to failure to pay maintenance fee

Effective date: 20180615